Q. A resistance wire connected in the left gap of a metre bridge balances a 10 Ω resistance in the right gap at a point which divides the bridge wire in the ratio 3 : 2. If the length of the resistance wire is 1.5 m, then the length of 1 Ω of the resistance wire is :
A) $1.0 \times 10^{-1}$ m
B) $1.5 \times 10^{-1}$ m
C) $1.5 \times 10^{-2}$ m
D) $1.0 \times 10^{-2}$ m
Explanation
[Solution] X/10 = 3/2 gives X = 15 Ω; 1 Ω corresponds to 1.5/15 = 0.1 m. Answer (1).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.